Tsunami Democratic is being investigated by Spanish authorities for promoting public disorders and criminal activities. So Spain is making what is need to to prevent criminal activities and (further) public disorders in Catalonia. I don't know how some Catalonian citizens are letting themselves be influenced by some corrupt politicians trying to enrich theirselves and avoid prison. Check out democracy index in Spain…
As for Tsunami Democratic, I'm afraid news reports haven't been fair. The disorders and criminal activities--which by the way the Spanish courts are labeling as "terrorism" despite any evidence--have been, by and large, carried out by infiltrated police agents. There is plenty of video footage online demonstrating case after case of police agents dressed as demonstrators, emerging from police vans in a side alley, joining a demonstration and engaging in deplorable behavior.